Supermax-prisons are high security prisons where inmates are kept isolated 24/7. It's a facility for "the worst of the worst". There are no jobs, no activities, hardly any educational programs and barely any human contact. You are locked in your 8-by-10-foot cell almost around the clock. You can't see the other prisoners in the cells adjoining yours, nor the guards watching from a central observation booth. Most of the time, all you can see through the fingertip-sized perforations in your cell's solid steel door is the wall of the eight-cell pod, the larger cage containing your cage. Guards deliver your meals. Once a day, the remote-controlled cell door grinds open, and you get 90 minutes to spend alone in a walled-in courtyard—a place more like the bottom of a mine shaft than an exercise yard. Your allowed to have 6 photographs and 4 books in your cell. 2 of them must deal with religious matters. If you can afford it and if you haven't violated any restrictions, you can be allowed to have a television in your cell. You won't be able to watch public television, but only the prisons own closed circuit television network where they show educational programs. The cell lights are never turned off, and prisoners who try to cover them to shield their eyes are penalised, setting back their chances of ever returning to a normal jail. Prisoners leaving the cell block wear a set of rigid metal handcuffs, known as a black box, which allows no movement of the wrists. They are strip-searched on their way out and on their way back. In some states, the conditions are even more extreme-e.g., lack of windows, denial of reading material, a maximum of three hours a week out-of-cell time, lack of outdoor recreation.
America's supermaxes have been denounced as inhumane by organizations from Amnesty International to the United Nations.

I don't see why the US practices capital punishment when they have these kind of facilities...This must be worse than "The Chair".

Supermax survival guide
3D-tour of a Supermax prison cell
Notes from Inside
Pelican Bay Prison-A necessary evil?
The Supermax solution

I'd go absolutely loco in a place like that...within two days!

Anyway..some of them do deserve to be locked up in a place like that...maybe...dunno...